The excavation, led by Cadw working with University of Central Lancashire and Manchester Metropolitan University, will break new ground exploring the landscape’s fascinating "rock art" – a term used in archaeology to describe the human-made markings found in natural stone.

This year, the team will explore along a ridge where a host of new outcrops covered in this "rock art" are found; it may be that even more rock art locations will be identified, further adding to the new picture of a rich ritual landscape around Anglesey’s celebrated tomb.

Members of the public got the chance to experience a real-life dig and see the newly discovered secrets at the open day.